Chevrolet Blazer Heating Ventilation and Air Conditioning

118 messages, Last post on Nov 01, 2009 at 9:53 AM

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#117 of 118 1999 Chevy S10 Blazer 4.3L engine by bigdaddy6886 Oct 31, 2009 (9:11 am)
Issue: no heat. A/C works fine, blower works fine, but it seems when I turn the temp control knob, it turns too easily. I understand there is a baffle that the knob controls to reroute from A/C to heat, but not sure where it is or how to get to it. My thermostat is fine, but going to replace it anyway, along with a new radiator cap. Have not completed a coolant flush, am scheduling that in the next couple of weeks. I also heard it might be some sort of relay switch, located under the hood near the firewall? Any assistance? Replies to this message: dfhltd (Nov 01, 2009 9:53 am)
#118 of 118 Re: 1999 Chevy S10 Blazer 4.3L engine [bigdaddy6886] by dfhltd Nov 01, 2009 (9:53 am)
Replying to: bigdaddy6886 (Oct 31, 2009 9:11 am) The first thing you should do is go to the dealer and get them to copy the diagrams from the parts catelog. There are acouple of them that show different views. Also get the pages which list the parts and description that go with the diagrams. this will help you find the baffels or doors (3) that control airflow and the parts that control them. Check the hoses at the firewall going in and out of the heater to see if they are hot.